Knife-grinding machine.



0. FACHMAN.

KNIFE GRINDING MACHINE.

APPLICATION man JULY 2. 1915.

1,155,803. Patentd 0%. 5,1915.

aktwmqg COLUMBIA PLANOURAPH c0., WASHINGTON, D. c.

osWALD FAGHMAN, or LINDSEY, onto.

KNIFE-GRINDING MACHINE.

To all whom it may concern Be it known that I, OswALD FAGHMAN, a citizen of the United States of America, and a resident of Lindsey, county of Sandu'sky, State of Ohio, have invented certain new and useful Improvements in Knife Grinding Machines, of which the following is a full and clear specification, reference being had to the accompanying drawing, in which is represented a perspective view of my improved apparatus.

This invention has relation to that class of grinding machines adapted for grinding mower and reaper knives as well as scythes and other tools, and the invention consists in certain novel features of construction hereinafter described and claimed.

The frame of my apparatus consists preferably of angle iron bars bent to form legs a and frame bars I) suitably connected together and braced. At the forward end of the frame a seat board 0 is fastened between the bars I), and at the rear end of the frame the grinding wheel cl is journaled, any suitable mechanism being provided for driving the stone. I show, for driving the stone, gear 6 affixed t0 the shaft ofthe stone, a pinion f meshing therewith and affixed to the shaft 9 j ournaled on the frame, this shaft being mounted in brackets it carried by bar i bolted to the top of the frame. The shaft 9 is provided with a belt wheel 7' and a crank handle 70 whereby the stone may be driven by hand or by power. If it is desired to drive the stone directly, a belt pulley may be fastened directly to the shaft of the stone, and if desired this pulley may be attached to the stone shaft at the opposite side of the stone, so that the machine will be capable of being driven directly orindirectly, and when driven directly the pinion 7 may be unmeshed from gear e by simply removing the bolts which fasten the bar 71.

The bars I; at a suitable point in front of the bearing of the grindstone are bent downwardly, so as to bring the front part of the frame on a plane lower than the rear part of the frame. The object of this is to bring the knife-holder, to be presently described, approximately in the same horizontal plane as the axis of the grinding wheel, so that during the grinding action the knife will press against the stone in an approximately horizontal direction, thereby making it more convenient for the operator than would be the case if the knife were arranged to press Specification of Letters Patent.

u n the stone at a point, any considerable distance above its "center.

Upon the frame, in front of the stone, is mounted a horizontal board Z which serves as a support for the knife-holder- This board is pivotally fastened to the top of the table or bench by means of a vertical bolt on provided with 'a clamp nut a, this bolt serving to ermit the supporting board Z teb adjusted to any suitable oblique angle with reference to the grinding face of the whe'el. To hold the supporting b ard in its adjusted position, I employ a bar 0' provided with an arcuate slot, this bar being ailixed t'o'the board Z. The slot in the bar 0 intersects a slot pin the 'seat'b oard, and by mfeans of these intersecting slots and a suitable clamp bolt "(1 the supporting board Z may, is obvious, he fastened'rigidly in any of its set positions. i

At each pedestal 11 andpivot'ally depending atthe upper end of each 'of these pedestals a swingingv arm 8. The arms 8 have affixed to their l'ow'er'free endsa horizontal bar 23, and mounted on the bar t is a sleeve a which is free to slide the'full length of the bar it and is adapted to rotat thereon. Aifixed tethe sleeve u is a end a the beard Z is 'afiixe'd a P f upwardly extending Patent-ed Oct. 5 i915.

Application mecaiu 2,1915. seminaevfiss.

arms 1) which carry the knife clamp to at their upper ends this knife clamp being of any. suitable construction being prefer:

ably provided with a handle rod m by whichv the. operator may swing the knife-holder toward or from the face of the wheel.

Carried by the swinging bail-like structure, consisting of the bar 25 and the arms 8. is a rod y which extends the full length of the bar 2? and is parallel therewith and also is located slightly in front and above the bar 6. Affixed to the rod 11 is a handle 2, by which the bail-like structure may be raised and lowered. To fix the bail in its adjusted position, I employ a curved plate a, affixed to the supporting board Z and arranged so as to cross the lever .2, this upstanding plate a being provided with an arcuate slot and a clamping bolt 7) being provided for locking the lever z to the rigid plate a at any point in its adjustment.

The feature of greatest importance in my apparatus is the manner in which the knifeholder may be adjusted. It will be observed that by mounting the knife-holder slidably upon a long horizontal rod, it may be readily moved across the face of the stone as the tool is ground. It will be seen also that by mounting this knife-holder pivotally upon a rod capable of being raised and lowered, it will be a simple matter to vary the angle of the tool-edge being ground with reference to the grinding face of the Wheel, so that in the case of cutter bars the teeth may either be ground along their entire edge or at the point or at the heel, as may be desired.

It will be understood that when grinding a mower knife, the operator constantly manipulates the tool holder by means of the lever 2 so as to grind from point to heel of the edge of each cutter and thus secure a uniform bevel. The only time the lever 2 is locked against movement by means of the thumb nut Z) is when grinding an instrument having a straight edge. It will be understood that I may use grindstones having either a straight face or a V face.

It will be observed also that the rod 1 is set away a distance from the bar t to which it is connected and with which it swings; the purpose of this is to enable the manipulating handle a to be placed in a convenient position for operation by one hand of the operator while he is with the other hand manipulating the tool holder by means of the handle m, at the same time permitting the tool holder to slide back and forth the full length of the bar t.

Having thus described my invention, what I claim is:

1. The combination with a bench and a grinding wheel journaled thereon, of a sup porting board and means for pivotally adjusting it horizontally, tending approximately the length of the board and means for swingingly suspending it at the ends thereof, thus permitting this bar to swing toward and from the wheel, a rod arranged approximately parallel with gether said upstanding a horizontal bar 6X-' said bar and lying at a distance therefrom and being connected thereto at its ends, a

handle attached to this rod, and a tool holder slidably and rotatably mounted upon said bar, for the purpose set forth.

2. The combination with a bench and a grinding wheel j ournaled thereon, of a sup porting board and means for pivotally adjusting it horizontally, a horizontal bar extending approximately the length of the board and means for swingingly suspending it at the ends thereof, thus permitting this bar to swing toward and from the Wheel, a rod arranged approximately parallel with said bar and lying at a distance therefrom and being connected thereto at its ends, a handle attached to this rod, a tool holder slidably and rotatably mounted upon said bar, and means for locking the swinging bar and the rod in adjusted position.

3. The combination with a bench and a grinding wheel journaled thereon, of a supporting board adjustably mounted on the bench in front of the grindstone, a pedestal or bearing block at each end of the board, a depending swinging arm on each pedestal, a horizontal bar connecting these arms, means for locking said bar in its adjusted position, said means consisting of a rod connecting said swinging arms, a lever attached to this rod, an upstanding bracket provided with a slot, and a. clamp bolt adapted to clamp tobracket and said lever, and a slidable and rockable knife clamp mounted on said bar.

In testimony whereof I hereunto aflix my signature.

OSWALD FACHMAN. Witnesses SOLOMON BURKETT, CLIFTON O. BOYER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

, Washington, D. G. 

